Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended				9 Months Ended
	Oct. 31, 2022	Apr. 30, 2022	Oct. 31, 2021	Apr. 30, 2021	Oct. 31, 2022	Oct. 31, 2021
Statement of Stockholders' Equity [Abstract]
Dividends declared per common share (in dollars per share)	$ 0	$ 2.24	$ 0	$ 2.20	$ 2.24	$ 2.20